The A20 Series (2 inch/51 mm dial) and the A25 Series (2-1/2 inch/64 mm dial) Swichgage models are diaphragm-actuated, temperature-indicating gages, with built-in electrical switches for tripping alarms and/ or shutdown devices. Ranges are available from 32°-120° F (0°-45° C) through 300°-440° F (160°-220° C).

Swichgage^® instruments are built in the USA and have protected engines and equipment in applications such as oil and gas, marine, irrigation, construction and trucking applications to monitor engine coolant, crankcase oil, transmission oil and others for more than 80 years.

• Dial: White on black; U.S.A. standard scale is dual scale °F/°C; others available
• Case: Glass filled/Polycarbonate, corrosion-resistant; steel mounting clamp included
• Bezel: Polished stainless steel, standard; others are available.
• Pointer: Tempered nickel silver; red tip
• Lens: Polycarbonate, high-impact
• Sensing Element: Beryllium copper diaphragm
• Capillary: PVC armored copper; 4 ft. (1.2 m).* Stainless steel armor optional
• Sensing Bulb: Copper*
• Gage Accuracy: See accuracy chart in Technical Bulletin
• Maximum Temperature: See Temperature Ranges and Factory Settings table in Technical Bulletin
• Maximum Ambient Temperature: -40° F (-40° C) through 150° F (66° C) Adjustable Limit Contact (A20T and A25T): SPST contact; pilot-duty only, 2 A @ 30 VAC/VDC; isolated from case ground Closed when the high limit is met. Normally Open when pointer is in normal operating range. Contacts are gold flashed silver.
• Limit Contact Adjustment: by a 1/16 in. hex wrench through 100% of the scale.
  • Wiring: A20T – Number 4 screw terminals; A25T – Number 6 screw terminals.
• Snap-Switch Rating (A20TE and A25TE): SPDT, 3 A @ 30 VDC inductive; 4 A @ 125 VAC inductive
  • Wiring: A20TE – Number 4 screw terminals; A25TE – Number 6 screw terminals
• Unit Weight:
  • A20 Series: 11.9 oz. (0.370 kg)
  • A25 Series Models: 13.3 oz. (0.413 kg)
• Unit Dimensions:
  • A20 Series: 4-3/4 x 4-3/4 x 3 in. (121 x 121 x 76 mm)
  • A25 Series Models: 4-3/4 x 4-3/4 x 2-3/4 in. (121 x 121 x 70 mm)

*For optional capillary lengths, engine adapters, sensing bulbs and range combinations, see Murphy bulletin 8428.

All configurations may not be available. Call your sales representative or Enovation Controls for more information.